<SEC-DOCUMENT>0001044321-14-000085-index.html : 20140811
<SEC-HEADER>0001044321-14-000085.hdr.sgml : 20140811
<ACCEPTANCE-DATETIME>20140808104146
ACCESSION NUMBER:		0001044321-14-000085
CONFORMED SUBMISSION TYPE:	SC 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20140808
DATE AS OF CHANGE:		20140808
GROUP MEMBERS:		ADAM C. STETTNER
GROUP MEMBERS:		AUSTIN W. MARXE
GROUP MEMBERS:		AWM INVESTMENT COMPANY, INC.
GROUP MEMBERS:		DAVID M. GREENHOUSE
GROUP MEMBERS:		MG ADVISERS. LLC
GROUP MEMBERS:		MGP ADVISERS LIMITED PARTNERSHIP
GROUP MEMBERS:		SPECIAL SITUATIONS CAYMAN FUND, L.P.
GROUP MEMBERS:		SPECIAL SITUATIONS FUND III QP, L.P.
GROUP MEMBERS:		SPECIAL SITUATIONS LIFE SCIENCES FUND, L.P.
GROUP MEMBERS:		SPECIAL SITUATIONS PRIVATE EQUITY FUND, L.P.
GROUP MEMBERS:		SSCAYMAN, LLC

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ARROWHEAD RESEARCH CORP
		CENTRAL INDEX KEY:			0000879407
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH [8731]
		IRS NUMBER:				460408024
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0930

	FILING VALUES:
		FORM TYPE:		SC 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-48710
		FILM NUMBER:		141026027

	BUSINESS ADDRESS:	
		STREET 1:		225 SOUTH LAKE AVENUE
		STREET 2:		SUITE 1050
		CITY:			PASADENA
		STATE:			CA
		ZIP:			91101
		BUSINESS PHONE:		626-304-3400

	MAIL ADDRESS:	
		STREET 1:		225 SOUTH LAKE AVENUE
		STREET 2:		SUITE 1050
		CITY:			PASADENA
		STATE:			CA
		ZIP:			91101

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	INTERACTIVE GROUP INC
		DATE OF NAME CHANGE:	20020509

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	INTERACTIVE INC
		DATE OF NAME CHANGE:	19940224

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MARXE AUSTIN W & GREENHOUSE DAVID M
		CENTRAL INDEX KEY:			0001044321
		IRS NUMBER:				000000000

	FILING VALUES:
		FORM TYPE:		SC 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		C/O SPECIAL SITUATIONS FUNDS
		STREET 2:		527 MADISON AVENUE, SUITE 2600
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022
		BUSINESS PHONE:		2123196670

	MAIL ADDRESS:	
		STREET 1:		C/O SPECIAL SITUATIONS FUNDS
		STREET 2:		527 MADISON AVENUE, SUITE 2600
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<FILENAME>arrowhead13gt1.txt
<DESCRIPTION>ARROWHEARD 13G/A
<TEXT>
Document 1 - file: arrowhead13gt1.txt

</DOCUMENT>
</SEC-DOCUMENT>